// util/hex.cpp

/*    Copyright 2013 10gen Inc.
 *
 *    Licensed under the Apache License, Version 2.0 (the "License");
 *    you may not use this file except in compliance with the License.
 *    You may obtain a copy of the License at
 *
 *    http://www.apache.org/licenses/LICENSE-2.0
 *
 *    Unless required by applicable law or agreed to in writing, software
 *    distributed under the License is distributed on an "AS IS" BASIS,
 *    WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 *    See the License for the specific language governing permissions and
 *    limitations under the License.
 */

#include <string>

#include "tbcore/util/hex.hpp"

TB_NAMESPACE_BEGIN

template<typename T>
std::string integerToHexDef(T inInt) {
  if(!inInt) 
    return "0";

  static const char hexchars[] = "0123456789ABCDEF";

  static const size_t outbufSize = sizeof(T) * 2 + 1;
  char outbuf[outbufSize];
  outbuf[outbufSize - 1] = '\0';

  char c;
  int lastSeenNumber = 0;
  for (int j = int(outbufSize) - 2; j >= 0; j--) {
      c = hexchars[inInt & 0xF];
      if(c != '0')
          lastSeenNumber = j;
      outbuf[j] = c;
      inInt = inInt >> 4;
  }
  char *bufPtr = outbuf;
  bufPtr += lastSeenNumber;

  return std::string(bufPtr);
}

template<> std::string integerToHex<int>(int val) { return integerToHexDef(val); }
template<> std::string integerToHex<unsigned int>(unsigned int val) { return integerToHexDef(val); }
template<> std::string integerToHex<long>(long val) { return integerToHexDef(val); }
template<> std::string integerToHex<unsigned long>(unsigned long val) { return integerToHexDef(val); }
template<> std::string integerToHex<long long>(long long val) { return integerToHexDef(val); }
template<> std::string integerToHex<unsigned long long>(unsigned long long val) { return integerToHexDef(val); }

TB_NAMESPACE_END
